EP0308055A2 - Assemblage de rotors pour compresseur à vis - Google Patents

Assemblage de rotors pour compresseur à vis Download PDF

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Publication number
EP0308055A2
EP0308055A2 EP88307165A EP88307165A EP0308055A2 EP 0308055 A2 EP0308055 A2 EP 0308055A2 EP 88307165 A EP88307165 A EP 88307165A EP 88307165 A EP88307165 A EP 88307165A EP 0308055 A2 EP0308055 A2 EP 0308055A2
Authority
EP
European Patent Office
Prior art keywords
curve
rotor
circle
male
screw
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP88307165A
Other languages
German (de)
English (en)
Other versions
EP0308055A3 (en
EP0308055B1 (fr
Inventor
Shoji Yoshimura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kobe Steel Ltd filed Critical Kobe Steel Ltd
Publication of EP0308055A2 publication Critical patent/EP0308055A2/fr
Publication of EP0308055A3 publication Critical patent/EP0308055A3/en
Application granted granted Critical
Publication of EP0308055B1 publication Critical patent/EP0308055B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/082—Details specially related to intermeshing engagement type pumps
    • F04C18/084—Toothed wheels

Definitions

  • the present invention relates to a screw rotor assembly for a screw compressor or a similar apparatus such as a vacuum pump or an expander.
  • FIG. 12 A profile proposed in Japanese Patent Publication No. 60-41238 is shown in Fig. 12 by way of example.
  • the profile is formed of a plurali­ty of sectional curves.
  • Fig. 12 shows the intermeshing portions of a male rotor 11 and a female rotor 12.
  • a male rotor tooth 11a consists of sectional curves a-b, b-c, c-d, d-e, e-f and f-g successively arranged in that order from the leading side to the trailing side
  • the female rotor tooth 12a consists of sectional curves A-B, B-C, C-D, D-E, E-F, F-G and G-H successively arranged in that order from the leading side to the trailing side.
  • Fig. 12 indicated at P M and P F are the respec­tive pitch circles of the male rotor 11 and the female rotor 12
  • at A M and A F are the respective tip circles of the male rotor 11 and the female rotor 12
  • at D M and D F are the respective root circles of the male rotor 11 and the female rotor 12.
  • the performance of the profile of the screw rotor is dependent mostly on the length of sealing line and the area of blow hole, and the performance is improved as both the length of sealing line and the area of blow hole are reduced.
  • a portion of a conventional profile corresponding to the curve e-f of the male rotor tooth 11a of the male rotor 11 is an arc of a circle, when either the length of the sealing or the area of blow hole is decreased, the other increases as indicated by a curve I in Fig. 13, and hence it has been impossible to reduce both the length of sealing line and the area of blow hole.
  • the present invention provides a screw rotor assembly comprising: a male rotor having male rotor teeth each formed in a profile consisting of curves a-b, b-c, c-d, d-e, e-f and f-g; and a female rotor having female rotor teeth each formed in a profile consist­ing of curves A-B, B-C, C-D, D-E, E-F and F-G; characterized in that
  • Fig. 1 similarly to Fig. 12, shows only an intermeshing portion of a screw rotor assembly embodying the present invention.
  • the screw rotor assembly comprises a male rotor 1 having male rotor teeth 1a, and a female rotor 2 having female rotor teeth 2a.
  • the male rotor tooth 1a consists of curves a-b, b-c, c-d, d-e, e-f and f-g successively arranged in that order from the leading side to the trailing side.
  • the female rotor tooth 2a consists of curves A-B, B-C, C-D, D-E, E-F and F-G successively arranged in that order from the leading side to the trailing side.
  • the respective forms of the curves are as follows.
  • the curve d-e is expressed by a function other than that of a circle so that the length l of sealing line and the area S of blow hole are located within the shaded area demarcated by the curve I in Fig. 13.
  • the performance of the screw rotor assembly of the present inven­tion is higher than that of the conventional screw rotor assembly.
  • Figs. 2 and 3 The dependence of the relation between the length L of sealing line and the area S of blow hole for R1, R2 and n is shown in Figs. 2 and 3, in which ⁇ 0 is varied, R1, R2 and n are constants, and broken lines represent the relation between the length l of sealing line and the area S of blow hole in the conventional screw rotor assembly shown in Fig. 12, in which the curve corresponding to the curve d-e is circu­lar.
  • the area S of blow hole of the screw rotor assembly of the present invention is reduced to approximate­ly one-third of that of the conventional screw rotor assembly at the maximum for the same length L of sealing line.
  • the position of a point K on the pitch circle P F is decided taking the tooth thickness of the female rotor tooth 2a into consideration.
  • the form of the curve C-D is depen­dent on the selection of a curve connecting the points D and K.
  • the function f( ⁇ ) includes points (0, 0), (1, 1) and ( ⁇ , ⁇ ).
  • ⁇ is an fixed value, and ⁇ is varied between ⁇ 1, ⁇ 2 and ⁇ 3 ( ⁇ 1 > ⁇ 2 > ⁇ 3) as shown in Fig. 5, the variation of the radius of curvature R of the curve D-K with the angle ratio ⁇ for ⁇ in the configuration shown in Fig. 4 is indicated by curves shown in Fig. 6.
  • the curve B-C is a hyperbola having a portion similar to an arc of a circle near the point B and a portion similar to a straight line near the point C. Therefore, the area S of blow hole is small, and the sealing point moves greatly as the rotors rotate, which suppresses the deterioration of the performance of the screw rotor assembly due to abrasion.
  • the male rotor teeth and female rotor teeth of the screw rotor assembly according to the present invention are formed respectively in the above-mentioned curvilinear forms a-b-c-d-e-f-g and A-B-C-D-E-F-G
  • the curve d-e reduces the length of sealing line and the area of blow hole
  • the curves B-C-D-E reduce the length of sealing line.
  • the length of sealing line and the area of blow hole in the screw rotor assembly of the present invention are about 10% and about 50% of those in the conventional screw rotor assembly shown in Fig. 12, respectively.
  • the present invention provides improved profiles for the male and female rotor teeth of the screw rotor assembly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
EP88307165A 1987-09-01 1988-08-03 Assemblage de rotors pour compresseur à vis Expired - Lifetime EP0308055B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP218951/87 1987-09-01
JP62218951A JPS6463688A (en) 1987-09-01 1987-09-01 Screw rotor for screw compressor

Publications (3)

Publication Number Publication Date
EP0308055A2 true EP0308055A2 (fr) 1989-03-22
EP0308055A3 EP0308055A3 (en) 1990-05-23
EP0308055B1 EP0308055B1 (fr) 1993-02-10

Family

ID=16727893

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88307165A Expired - Lifetime EP0308055B1 (fr) 1987-09-01 1988-08-03 Assemblage de rotors pour compresseur à vis

Country Status (5)

Country Link
US (1) US4890991A (fr)
EP (1) EP0308055B1 (fr)
JP (1) JPS6463688A (fr)
KR (1) KR930006373B1 (fr)
DE (1) DE3878363T2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0591979A1 (fr) * 1992-10-09 1994-04-13 Mayekawa Mfg Co.Ltd. Profil des dents pour rotor à vis
GB2299135A (en) * 1994-06-02 1996-09-25 Chen Chia Hsing Screw compressor rotor profiles
EP1008755A1 (fr) * 1998-12-10 2000-06-14 Carrier Corporation Machine à rotors à vis
US7163387B2 (en) * 2002-12-16 2007-01-16 Carrier Corporation Meshing helical rotors
CN100365284C (zh) * 2004-03-30 2008-01-30 肖文伟 一种螺杆泵转子新齿型

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5624250A (en) * 1995-09-20 1997-04-29 Kumwon Co., Ltd. Tooth profile for compressor screw rotors
US6000920A (en) * 1997-08-08 1999-12-14 Kabushiki Kaisha Kobe Seiko Sho Oil-flooded screw compressor with screw rotors having contact profiles in the shape of roulettes
KR100425414B1 (ko) * 2002-01-25 2004-04-08 이 재 영 스크류 압축기용 로우터의 치형
KR101012291B1 (ko) * 2008-10-06 2011-02-08 경원기계공업(주) 스크류 압축기용 로우터의 치형
JP5542382B2 (ja) * 2009-07-27 2014-07-09 株式会社日立産機システム スクリュー圧縮機
GB2501302B (en) * 2012-04-19 2016-08-31 The City Univ Reduced noise screw machines
CN106555753A (zh) * 2015-09-29 2017-04-05 上海汉钟精机股份有限公司 高效率齿型的转子组

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3773444A (en) * 1972-06-19 1973-11-20 Fuller Co Screw rotor machine and rotors therefor
US4140445A (en) * 1974-03-06 1979-02-20 Svenka Rotor Haskiner Aktiebolag Screw-rotor machine with straight flank sections
GB1503488A (en) * 1974-03-06 1978-03-08 Svenska Rotor Maskiner Ab Meshing screw rotor fluid maching
US4088427A (en) * 1974-06-24 1978-05-09 Atlas Copco Aktiebolag Rotors for a screw rotor machine
DE2911415C2 (de) * 1979-03-23 1982-04-15 Karl Prof.Dr.-Ing. 3000 Hannover Bammert Parallel- und außenachsige Rotationskolbenmaschine mit Kämmeingriff
DD146481A1 (de) * 1979-10-12 1981-02-11 Dieter Prockat Rotorprofil fuer schraubenverdichter,vorzugsweise fuer kleine kaeltemittelschraubenverdichter
IN157732B (fr) * 1981-02-06 1986-05-24 Svenska Rotor Maskiner Ab
JPS60212684A (ja) * 1984-04-07 1985-10-24 Hokuetsu Kogyo Co Ltd スクリユ・ロ−タ
US4527967A (en) * 1984-08-31 1985-07-09 Dunham-Bush, Inc. Screw rotor machine with specific tooth profile
JPS61201894A (ja) * 1985-03-04 1986-09-06 Hitachi Ltd スクリユ−ロ−タ歯形

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0591979A1 (fr) * 1992-10-09 1994-04-13 Mayekawa Mfg Co.Ltd. Profil des dents pour rotor à vis
GB2299135A (en) * 1994-06-02 1996-09-25 Chen Chia Hsing Screw compressor rotor profiles
GB2299135B (en) * 1994-06-02 1999-01-06 Chen Chia Hsing Screw compressor rotor profiles
EP1008755A1 (fr) * 1998-12-10 2000-06-14 Carrier Corporation Machine à rotors à vis
US7163387B2 (en) * 2002-12-16 2007-01-16 Carrier Corporation Meshing helical rotors
CN100365284C (zh) * 2004-03-30 2008-01-30 肖文伟 一种螺杆泵转子新齿型

Also Published As

Publication number Publication date
DE3878363D1 (de) 1993-03-25
JPS6463688A (en) 1989-03-09
JPH034757B2 (fr) 1991-01-23
KR930006373B1 (ko) 1993-07-14
DE3878363T2 (de) 1993-08-05
KR890005392A (ko) 1989-05-13
US4890991A (en) 1990-01-02
EP0308055A3 (en) 1990-05-23
EP0308055B1 (fr) 1993-02-10

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